It's their standard. Their metric. [And, co-incidentally, the one he was measured against long before he became Kylo Ren. The one they used to condemn him when they found him wanting. Which Kylo isn't about to explain, if he's even consciously aware of the reason this bitterness bleeds into his voice.] Their hypocrisy.

[He sucks in a breath, apparently... failing to steady himself.]

What does it matter to you? My promise. What I did or didn't do. How I feel about it.